From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Departmental memo to Mr. Royce regarding a 10,000-mile rig test for Taper Valve Springs, with his handwritten notes on material and heat treatment.
| Identifier | ExFiles\Box 80\3\ scan0217 | |
| Date | 10th September 1912 | |
| ROLLS-ROYCE LIMITED, NIGHTINGALE ROAD, DERBY. TELEGRAMS: "ROYCAR," DERBY. TELEPHONES: 813 (TWO LINES). DEPARTMENTAL MEMO. This column is for Name of Person addressed: Mr. Royce DATE: 10/9/12 Re Valve Springs. Mr. Platford reports that the second set of special Taper Valve Springs have now run over 10,000 miles on the rig without any failure. (Signature) TBBarington (Handwritten note in margin) Valve springs (Handwritten note) This would suggest that proportions are correct, but I understand further test show want of uniformity,. After hardening at lowest possible temperature in cold oil or water or salt bath let them down. in boiling oil until they take permanent set rather than break when tested on rig or by an excess of tension there should be no difficulty in getting them soft enough, we were able to do so years ago with pot of Tallow with gas jet under. Use the chrome steel which gave such good results on road springs when we hardened it. (Signature) FHR This sheet must be filed with the correspondence to which it refers. | ||